Infiniti Q45. Manual - part 376
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-143
C
D
E
F
G
H
I
J
K
L
M
A
EC
25.
CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
●
Crushed air ducts
●
Malfunctioning seal of air cleaner element
●
Uneven dirt of air cleaner element
●
Improper specification of intake air system
OK or NG
OK
>> GO TO 27.
NG
>> Repair or replace malfunctioning part, and then GO TO 26.
26.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and make sure that the indication is within the
SP value.
OK or NG
OK
>> INSPECTION END
NG (Less than the SP value)>>GO TO 27.
27.
CHECK “MAS A/F SE-B1”
Select “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG
OK
>> GO TO 28.
NG (Less than the SP value)>>Replace mass air flow sensor, and
then GO TO 30.
28.
CHECK INTAKE SYSTEM
Check for the cause of air leak after the mass air flow sensor. Refer to the following.
●
Disconnection, looseness, and cracks in air duct
●
Looseness of oil filler cap
●
Disconnection of oil level gauge
●
Open stuck, breakage, hose disconnection, or cracks of PCV valve
●
Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid
valve
●
Malfunctioning seal of rocker cover gasket
●
Disconnection, looseness, or cracks of hoses, such as vacuum hose, connecting to intake air system
parts
●
Malfunctioning seal of intake air system, etc.
>> GO TO 30.
29.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> Detect malfunctioning part according to
PBIB2370E